Downloaded Sims 3 +Supernatural years ago, can't download supernatural anymore

The title is a bit of a giveaway, but I downloaded Sims 3 +Supernatural a couple years ago and now that I'm transferring all of my sims data to my laptop I'm completely unable to download supernatural. This really sucks, because most of the households I've made have supernatural sims of some kind in them, and I can't play them for fear of losing that. Can anybody fix my conundrum?